Drilling and centering tool



(No Model.)

J. E. KETCHEM.

DBILLING AND G BNTBRING TOOL. No. 395,833. Patented Jan. 8, 1889.

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`UNITED STATES PATENT OFFICE.

.IOHN E. KETOHEM, OF MORRIILTON, ARKANSAS.

DRILLING AND CENTERING TOOL.

SPECIFICATION forming part of Letters Patent No. 395,833, dated January 8, 1889.

Application tiled June 22, 1888. Serial No. 277,828. (No model.)

To @ZZ whom t may concern:

Be it known that I, JOHN E. KETCHEM, of Horrillton, in the county ot' Conway and State of Arkansas, have invented a new and useful Improvement in Drilling' and Center-Marking' Tools, of which the following' is a specification.

My invention is an improved drilling and centering' tool intended especially for watchmakers use; and the invention consists in certain novel constructions and combinations of parts, as will be hereinafter described and claimed.

In the drawings, Figure l is a side view of the device. Fig'. 2 is a detail perspective view ot' the frame; and Figs. 3 and Je show, respectively, the center-marking' and drilling' tools.

' The frame A has posts B B', provided with horizontal bearings l) b and with clamping'- screws C C', intersecting' said opening'. The centering-rml D fits in bearing 1)', and maybe clamped in position by the screw C. .In the bearin L, I prefer to iit a tube-like bushing', E, having' its central opening contracted at e to the proper size to just permit the passage of the points ofthe center-marking and drilling' tools, which tools need no particular description. rlhe said tube E may be secured in any desired adjustment by the screw (Y, and forms, as shown, the front bearing' for the tools.

The back center, l", is supported in arm G on slide-rod ll, which arm and slide-rod coni stitute the center-support. The rod II eX- tends through opening o in frame A, and is actuated by spring' I, preferal'ily arranged to bear between frame A and a nut, b, threaded on rod H, so that the force of the tension eX- erted by said spring on the slide-rod and its parts may be adjusted as desired.

A stay-rod, J, connected with arm G and entering opening' o in frame A, braces the arm G against lateral play.

It will be seen that by means of the spring a steady feed-pressure maybe exerted on the tool, whether the center-marker or drill, either of which may be conveniently applied to the machine; also that such pressure may be reg'- ulated and adjusted so as to properly feed the tool in working' in different materials.

The construction, as shown, is simple, easily adjusted in use, and in operation serves to prevent any clogging or clicking of the center-marker and drill.

Having thus described my invention, what I claim as new isl. In a tool substantially as described, the combination of the framing, a slide-'rod operating in said framing and provided with an arm or portion supporting' the back center,

and a spring arranged to actuate said sliderod, whereby to feed the drill forward in the operation of the device, substantially as set forth.

2. The combination, in a tool substantially as described, of the framing', the slide-rod extended through an opening' in the frame and having' arm or portion G, supporting' the back center, a spring' on said slide-rod, and a nut threaded on the slide-rod and forming an adjustable bearing' for the actuating-spring, substantially as set forth.

The combination, with the framing', the slide-rod, the spring [for actuating' said sliderod, and the arm or portion G, of a stay-rod extended from arm G and entering' a g'uideopening in the training', substantially as set forth. p

-l. The improved tool, substantially as described, consisti ng of the trame having a bearing for one end ot' the drill or center-marker, the arm or portion arranged in rear of said bearing and supported by the rod, the spring' arranged to operate said rod and give the arm a tension toward the bearing' in the frame, and the back center supported in said arm or portion and arranged in rear of and in alignment with the bearing' in the frame, all substantially as described, whereby the back center may be fed forward automatically, as and for the purposes specified.

5. The improved tool herein described,'con sistingl of the frame having openings u. af, the slide-rod H, operating through opening' a. and having arm G, having' a back center and provided with a stay-rod extended into the opening of, and the actuating-spring', all substantially as and for the purposes specified.

JOHN E. KETOHEM. lVitnesses:

THos. C. NIKON, WILL E. EDMoNDs. 

